how to check when UIScrollView end scroll

UIScrollView_did_end.m

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    //[super scrollViewWillBeginDragging:scrollView];   // pull to refresh

    self.isScrolling = YES;
    NSLog(@"+scrollViewWillBeginDragging");
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    //[super scrollViewDidEndDragging:scrollView willDecelerate:decelerate];    // pull to refresh

    if(!decelerate) {
        self.isScrolling = NO;
    }
    NSLog(@"%@scrollViewDidEndDragging", self.isScrolling ? @"" : @"-");
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    self.isScrolling = NO;
    NSLog(@"-scrollViewDidEndDecelerating");
}

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
{   
    self.isScrolling = NO;
    NSLog(@"-scrollViewDidScrollToTop");
}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
    self.isScrolling = NO;
    NSLog(@"-scrollViewDidEndScrollingAnimation");
}